When I run this command:
```find . -type f -name '*.java' | /path/to/phabricator/scripts/symbols/generate_ctags_symbols.php | /path/to/phabricator/www/phabricator/scripts/symbols/import_project_symbols.php blah```
I receive the following message:
```Project 'blah' is unknown. Upload a diff to implicitly create it.```
Here's what my `.arcconfig` file contains:
```{
"project_id" : "blah",
"conduit_uri" : "http://www.myphabricatorinstall.com/"
}```
I've created a diff using `arc diff` and it seemed to work (i.e., it showed up on the web interface), although I can't say I //really// understand Differential.
What do?